Waveform correction filters
a filter and waveform technology, applied in the field of waveform correction filters, can solve the problems of power pollution detracting from efficiency, distorted waveform of power supplied to such equipment, and transformers,
Active Publication Date: 2007-09-27
ENVIRONMENTAL POTENTIALS
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Benefits of technology
[0018] Another circuit connected in parallel with a load device constitutes a low pass filter having a capacitor connected in parallel with a resistor with frequencies above a desired frequency absorbed in the resistor and dissipated as heat, rather than flowing back into the lines connected to the load or to the ground where such higher frequencies would constitute a disturbance in the overall system.
[0019] For loads such a telephones or televisions connected to cable or satellite transmission having two leads, the waveform correction circuits are connected in series/parallel fashion. In the embodiments described herein, the circuits discriminate against frequenci
Problems solved by technology
Much of the newer equipment now in use is sensitive to transient voltages, such as spikes, power surges, and random radio frequency (r.f.) noise; but at the same time, such equipment may be creating its own transient voltages which it injects back into the power line.
All of these kinds of power pollution detract from the efficiency of, inter alia, electric motors, generators, and transformers.
The waveform of the power supplied to such equipment becomes distorted, resulting in the creation of eddy currents in the ferrous metal parts of such equipment, such as transformer cores and motor stators and rotors.
The result is that eddy currents in a motor, for example, dissipate power as heat causes it to consume more power to perform the same tasks.
The motor may become damaged, either from the effect of excessive heat or from damage to insulation, causing it to break down long before its expected life.
While much has been done to improve that quality of the power being supplied to various consumers, there has been little recognition of the power pollution produced within a single facility as a result of the operation of significant numbers of electric motors, switches, computers, and other power-consuming devices.
These reverberations bounce back and forth until they are absorbed or have done damage within the system.
Other disturbances occur when loads are unbalanced in three-phase lines, causing undesirable phase differences between voltage and current.
It is such loads that are principal contributors to electric power pollution.
Further, in a digital logic control system, where binary bit patterns are used to implement control signals, random impulsive noise can knock out bits or put in bits where they should not exist.
Thus, the control signal is altered and the desired action is lost.
Method used
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[0028]FIG. 1, referred to in the “Background of the Invention” above, is a graph showing the distortion of a sinusoidal waveform resulting from a high frequency transient voltage being imposed on it.
[0029]FIG. 2 shows a first embodiment of my invention, which would normally be a three-phase system but which, for simplicity, is shown with a single phase. In this embodiment, as well as others described hereafter, the circuits for the remaining phases are identical to the one shown. This embodiment includes a source, such as an electrical generator 11 connected across a load 12 through lines 9 and 10. Connected in parallel with load 12, between lines 9 and 10, is a filtering circuit 16A.
[0030] The component items in this schematic are described functionally as follows: [0031]2 FUSE, protective line type [0032]1 INDUCTOR, ferrite bead [0033]3 VARISTOR, metal oxide [0034]4 CAPACITOR, polypropylene ac rated [0035]5A &5B MAGNETIC CORES, nanocrystalline toroidal [0036]6&7 RESISTOR, carbon...
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A number of wave correction filters are disclosed which respond to power surges or spikes outside the intended frequency and / or voltage for a load device. The circuits respond to such undesired frequencies and voltage levels by sensing and separating them from the desired voltage and frequencies and connecting the energy from such undesired voltages and / or frequencies to resistors where it is dissipated as heat. In this way, the resulting energy is prevented from distorting the input voltage to the load device. It is also retained in the filter and prevented from traveling through a ground connection to pollute other related circuits.
Description
BACKGROUND OF THE INVENTION [0001] For many years, those who are responsible for monitoring usage of significant amounts of alternating current power have been concerned with the quality of such power. Much of the newer equipment now in use is sensitive to transient voltages, such as spikes, power surges, and random radio frequency (r.f.) noise; but at the same time, such equipment may be creating its own transient voltages which it injects back into the power line. When switches turn off and on, reverberating impulses are created on the line. Motors that start and stop cause power impulses known as surges. [0002] Besides random r.f., pollution, electrical machinery of various kinds may generate harmonic frequencies. All of these kinds of power pollution detract from the efficiency of, inter alia, electric motors, generators, and transformers. The waveform of the power supplied to such equipment becomes distorted, resulting in the creation of eddy currents in the ferrous metal parts...
Claims
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CPCY02E40/40H02J3/01
InventorPICKETT, ANDREWTHIBAULT, THEODOREPRICE, EDWARD G.
OwnerENVIRONMENTAL POTENTIALS